Backpack



FIG. 1 is a perspective view of a backpack showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the backpack thatform no part of the claimed design.

CLAIM The ornamental design for a backpack, as shown and described.